Use USB installer to install High Sierra.ĩ. Use USB installer Disk Utility to format SSD.Ĩ. Make USB bootable installer of High Sierra on flash drive, with the appropriate version that supports your unsupported 2009 MBP.ĥ. Backup your most important data somewhere else too.Ĥ. Just don't erase the HD before you remove it.ģ. The good news about installing an SSD is that once you remove the HD, you automatically have a backup already. And yes, it's always best to have MULTIPLE backups before any such process. Personally I would recommend a clean install anyway, but that would require you re-installing all your downloaded software. Is it even possible to do an in-place upgrade from El Capitan to High Sierra on an unsupported machine? I'm not sure. High Sierra + 8 GB + hard drive = painful High Sierra + 4 GB + hard drive = painful SSD is mandatory though, even more so than memory. Sierra offers no advantages over High Sierra, not even performance. The most common reasons are the use of ill-conceived non-Apple "anti-virus" junk that should never be installed on any Mac to begin with.Agreed. If your Mac cannot connect to the App Store, another problem exists for which more information will be required. Find the icon labeled Install macOS Sierra and tap it. The easiest way to find the installer app so that you can launch it might be to use Launchpad: macOS Sierra: Use Launchpad to view and open apps. To install Sierra you have to launch its installer app. As of this data the only available installer will provide macOS 10.12.4. Mac app store does not show Sierra 10.12.0 as well. The app will be deposited in your Mac's Applications folder. Downloading is not the same as installing. Once the download is complete, the downloaded file will be a launchable app - not a package or disk image file. The reason is that there will not be one, so don't bother looking for it. I can not find anywhere a PKG file of Sierra 10.12.0.
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